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08-12-2018, 05:26 PM
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#1
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Member
Newmar Owners Club Spartan Chassis
Join Date: Jan 2017
Location: Plainfield, Indiana
Posts: 56
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Crankshaft Pulley Failure
We have a 2011 VTDP 4333 with Tag. On July 25th, we experienced a crankshaft pulley failure. The motor in our coach is a Cummins ISC 360 HP. Fortunately for us, we were in Elkhart, Indiana at the time with an HWH Jack issue and we were able to get it to Onan of Indiana (a local Cummins shop) (and thank you Spartan Chassis for recommending them). They were able to secure the part and fix our ailing coach. We are back on the road!
My question is, has anyone experienced this type of failure. Onan of Indiana thought it might be due to rust but they are not sure either. To me, it looks like the metal has been sheared or torn off. Take a look at the pictures and tell me what you think.
The motor has 50,140 miles.
Thanks in advance!
__________________
Warren and Kathy
2011 Newmar Ventana 4333
2004 Newmar Dutch Star 3807 (sold)
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08-12-2018, 05:46 PM
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#2
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Senior Member
Join Date: Nov 2016
Posts: 377
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Looks to me like pulley too thin and edge weld cracked due drive load of all accessories, did you get a chance to see new one regarding any changes to it. Bet its a little thicker.
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08-12-2018, 06:15 PM
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#3
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Senior Member
Join Date: Jul 2017
Posts: 207
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Something hit the pulley. If the pulley would have failed, from bad welds it would have let the belt slip off and it would not have that bend in it.
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08-12-2018, 09:44 PM
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#4
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,500
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Was the replacement , the same ??
Steel ?
Most Cummins engines that I've worked on the serpentine belt drive / harmonic balancer is machined from cast iron. 
EDIT: Sorry I guess I spent too much time on 5.9 Cummins repair , Just not what I was used to seeing . Found an image of your belt drive on line , but no other pictures of a failure like yours.
First image , 5.9 balancer and belt drive .
Second , an ISC part.
I've learned something today ... guess it's time to hang it up for the night. 
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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08-13-2018, 01:21 AM
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#5
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Senior Member
Join Date: Jun 2018
Posts: 529
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Question. Why does your failed pulley say "Harbor Freight" on it?
__________________
Woody & Sandy
2003 Chinook Cascade
2008 Newmar Kountry Star 3623
[SIGPIC][/SIGPIC]
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08-13-2018, 05:51 AM
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#6
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Senior Member
Join Date: Jan 2011
Posts: 400
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Quote:
Originally Posted by WoodyS
Question. Why does your failed pulley say "Harbor Freight" on it?
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That would explain why it failed
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08-13-2018, 10:04 AM
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#7
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Senior Member
Join Date: Nov 2016
Posts: 377
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Quote:
Originally Posted by Caliber
Something hit the pulley. If the pulley would have failed, from bad welds it would have let the belt slip off and it would not have that bend in it.
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Could be something hit it , could be someone priced against it working on something else recently, but if you look in the weld break it’s all rusty not shinny been that way for a while.
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08-13-2018, 10:15 AM
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#8
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"Formerly Diplomat Don"
Newmar Owners Club
Join Date: Apr 2005
Location: Moorpark, Ca.
Posts: 24,125
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It looks like it was hit, but I think if part of the weld went bad, the power of the serpentine belt, folded it like that when one portion of it broke loose.
__________________
Don & Mary
2019 Newmar Dutch Star 4018 (Freightliner)
2019 Ford Raptor
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08-13-2018, 10:18 AM
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#9
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Senior Member
Join Date: Nov 2016
Posts: 377
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Seen this issue mentioned on a few of this model Cummins. May be worth taking a look at it on some other coaches
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08-13-2018, 10:46 AM
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#10
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Registered User
Join Date: Aug 2017
Posts: 2,079
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Quote:
Originally Posted by Dutch Star Don
It looks like it was hit, but I think if part of the weld went bad, the power of the serpentine belt, folded it like that when one portion of it broke loose.
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It would be interesting to see the proximity of this pulley to the "Newmar Road Scraper" below. Not hard to imagine the scraper tossing a rock up into the pulley above.
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08-13-2018, 09:11 PM
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#11
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Senior Member
Monaco Owners Club Newmar Owners Club Texas Boomers Club Spartan Chassis
Join Date: Jan 2010
Location: New Braunfels, Texas
Posts: 1,308
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Crankshaft Pulley Failure
In would have expected a machined casting in that application, not a pully welded up as this one appears to be. I agree with Don that some road debris may have got tossed up into the belt area and tore it up.
__________________
Dan & Linda
FMCA 399045 NKK 22240
2020 Dutch Star 4081 - Spartan K2
2017 Dutch Star 4018 - Sold - Towing Jeep Grand Cherokee Trailhawk
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08-13-2018, 09:18 PM
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#12
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Senior Member
Damon Owners Club Freightliner Owners Club
Join Date: Mar 2006
Location: North East Texas
Posts: 4,946
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Quote:
Originally Posted by WoodyS
Question. Why does your failed pulley say "Harbor Freight" on it?
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x2
it looks pretty flimsy compared the pulleys on my engine
__________________
USN Retired, Life time member of the DAV.
Enjoying the 2008 Damon Tuscany 4056, #3998 no your eyes are fine, there are really 6 slides
2022 F150 King Ranch or 2012 Edge toads
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08-14-2018, 09:03 AM
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#13
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Senior Member
Newmar Owners Club
Join Date: Jul 2014
Posts: 242
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I’ve got the same engine in a 2010 - 4333. I just took a look at mine. There is a shield at the front of the pulley, and the pulley assembly sits above a motor mount. Very unlikely something from road bounced up and damaged it. I can’t even see the pulley were the belt rides due to the shield.
__________________
Tom Sawyer
2010 Ventana 4333, Spartan w/Cummins ISC 360HP
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08-14-2018, 12:40 PM
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#14
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Senior Member
Join Date: May 2017
Location: Metamora, MI
Posts: 5,525
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Certainly needs to be replaced. New belt too. I am sure that will address the issue.
Is it a matter of who is paying? ie: a manufacturers defect vs. maintenance vs. accident damage?
2011 MY, doesn't make any difference...hopefully you got the labor and part at a reasonable price.
__________________
2002 Newmar Mountain Aire Limited 4370 w/ Spartan K2 and Cummins 500hp
ASE Master Certified (a long.....time ago...)
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